<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
function Person(){
    this.name = "abc"
}
Person.prototype.girls = ["a", "b"];
var p1 = new Person();
p1.girls = ["a"];
var p2 = new Person();
console.log(p2.girls);

var s = "abc";
s = s + "a";
console.log(s.toUpperCase());

</script>
</body>
</html>
<!--
对象分两种:
1. 可变对象
    自定义的对象, 数组

2. 不可变对象
    字符串
    
    12


-->